
We can compare this to the pocket formula in [1]} giving the final state particle multiplicity as a power of the total initial energy density for single conformal fluid attractors via \((S\tau )_{\rm hydro}\sim (e\tau )_0^{2/3}\)  to see that the interactions due to the effective metric coupling in our hybrid model increases the scaling exponent from \(2/3\)  to \(3/4\)  for \(\tau _0 = \gamma ^{1/4}\) . The pocket formula of [1]} states that the total particle multiplicity per unit rapidityHere, the rapidity, \(\eta \) , should not to be confused with the shear viscosity. follows
\(\frac{dN}{d\eta } \approx (S\tau )_{\rm hydro}.\) 
